If this is true, how does Michael Phelps have a six pack with a 10,000 calorie a day habit?
Scientist busts myths about how humans burn calories
601–610 of 753 posts
Re: Scientist busts myths about how humans burn calories
#602Irony. A linked article describing a scientist trying to rigorously find out how weight changes and energy expenditure and diet are connected, revealing the little we do know and the vast sea of what we do not know. The discussion here: full of anecdotes and bro science berating one another "that's not how it works, it works like this", "I personally do this-and-that", "you just have to x-y-z, it's that simple".
Yes. And no. Bro science is more or less useless. But the article isn't super useful either. Calories burned are "adjusted for nonfat body mass." Adjusted how? Fat stores energy. Food adds energy. Exercise uses energy. Those aren't "myths." The article (not talking about the scientist) is very difficult to understand, but it seems to come down on the "myth" side of that dilemma. Mostly. Kind of.
When you do the math, your body turns out to be extremely efficient. Two full hours of very hard exercise burns the equivalent of one average sized lunch meal.
Skipping meals/cutting calories is, by far, the easiest way to lose weight.
Re: Scientist busts myths about how humans burn calories
#603I don't believe this research. I think the measurement of burning calories might be flawed. If you don't burn more calories by exercising how does Michael Phelps have a six pack with his 10,000 calorie a day diet?
Re: Scientist busts myths about how humans burn calories
#604Earlier quoted context omitted.
Yes counting calories is essential, I had very similar experience (walk 10 km on the weekend ~= burn 600 kcal, then buy a 1000 kcal snack on the way back and wonder why I'm not losing weight), but still the exercise makes a big difference. Last year in march I started counting calories, recording my weight and all exercises I did and walking/biking every day. I lost 30 kg, walked 2100 km, biked 1000 km, and the sum o…
Congratulations! I would be happy to lose "only" 10 kg (hell, 5 kg would be good for a start), but since Covid and home office my weight has been (slowly, but steadily) going in the wrong direction. Yeah, you can and do burn calories by exercising, but it's depressing how little it is. And it's also depressing if I look at the graph that some 40 to 50 year olds seem to still have the metabolism of a toddler - I'm def…
I've struggled with this a lot over the past 10 years. I was 60lbs (27kg) over my weight from leaving university 25 years earlier, I sit a lot, and am late forties. The last few years have been harder, and I've been bouncing between a small range, and couldn't 'break out'.
Others have suggested 'writing it down' - not going to argue with that. I don't 'write down' every food I eat, but I do make mental notes every day. What's helped me more though...
2 years ago I bought a fitbit - basic model, nothing fancy, but got serious about tracking my movements. It helped create some easier external documentation about what I was doing. I then moved to an Apple Watch last May, and have been following the '3 circles'. It gave me a target 'move X calories per day' target, do X minutes of 'exercise' every day (exercise seemingly defined as 'get your heart rate above Xbpm').
I've hit those targets ALMOST every day (I missed one calorie target 1 day by 13!). I'm on day ... 206 of my movement streak.
For me, the visual reminders on my wrist help keep me motivated/focused. I 'compete' against a couple of friends with the watch now and then, but just being connected and getting a thumbs up from a friend now and then is motivating.
As others said, track weight daily - I track morning and night. I put it in my iphone. I look at the graphs. I see the downward trend. THIS HELPS A LOT when it bounces back up a bit now and then. I'm up ... around 1.5 lbs from earlier this week. JUST seeing that uptick used to demotivate me. But looking at the downward trend of the last 7 months, I can see the larger direction is down, and I don't stress as much about small upticks. I'm down 25lbs (11kg) from last June, and at this pace will probably be down another 15 or so by this year.
I used to go to a gym, but ... it's a 'process'. I now often just go outside and jog around. There's a run club once per week, and weather permitting, I'll do it, but... I hit those targets every day. Even if it's just running in place, or getting on an exercise bike, or jumping rope. I tell myself "every little bit helps", and tracking every one of those 'little bits' has been the motivating factor for me. May be different for others, but keep going till you find something that works for you.
Took me years to find some 'thing' that clicked for me, but I'm closing in on one year of losing weight based on 'more movement' and 'fewer snacks' and 'better eating'. But it took weeks before there was a trendline to see a downward line.
Re: Scientist busts myths about how humans burn calories
#605What I feel much of this misses is the effect of exercise on metabolism. You have two energy pathways in your body, the quick glucose burning pathway and the slow and efficient fat burning pathway. By getting your heart rate up into the edge of the zone in which you are using that fat burning pathway but almost into the quicker glucose burning pathway, you work that pathway out and become more metabolically efficient / healthy.
Yes you can lose weight or maintain weight without exercise, but you can still get diabetes or other aspects of metabolic syndrome.
Plus exercise does help burn more calories. Sure it’s not as strong of an effect, but it helps. The more metabolically healthy you are the more capable you become of managing weight from what I can tell, but obviously to a certain degree you are a victim of your genetics.
Re: Scientist busts myths about how humans burn calories
#606Earlier quoted context omitted.
Also anecdotal, but I’m not an athlete (like, the inverse of an athlete, I’m overweight and don’t move enough) and moderate exercising does, in my case, suppress some appetite. I eat les after exercising. My 2 cents theory is that it suppress the "stress induced" appetite.
It might also increase dopamine. I have ADHD and there are two things that let me focus better and feel less hungry: stimulants and exercise.
Oh ! I have ADHD too so maybe it’s that.
Re: Scientist busts myths about how humans burn calories
#607Irony. A linked article describing a scientist trying to rigorously find out how weight changes and energy expenditure and diet are connected, revealing the little we do know and the vast sea of what we do not know. The discussion here: full of anecdotes and bro science berating one another "that's not how it works, it works like this", "I personally do this-and-that", "you just have to x-y-z, it's that simple".
This. And it is brutal. It’s truly amazing how many Michael Phelps or “when I was twenty” responses there are.
Re: Scientist busts myths about how humans burn calories
#608I think it was someone in an HN comment who put it best: > exercise determines shape, diet determines size
Another formulation that I like:
Exercise to build muscle, eat to lose fat
Re: Scientist busts myths about how humans burn calories
#609Earlier quoted context omitted.
I just have a hard time believing it to be true that no amount of exercise will increase the overall caloric expenditure. For example, I've done a few multi-week bike tours, and we ate an enormous amount of mostly pasta every day, and managed to peel off a few pounds each by the end of it.
The article mentions a study that tracked energy expenditure of runners over many weeks, and found that the energy expenditure was much lower at the tail end of the experiment, suggesting the body gets accustomed to the activity somehow and burns less energy.
The study must have tracked non-runners, given the conclusion. If they were already runners and the conclusion is that they get accustomed to the activity, they'd already be accustomed and there'd be no tail end difference.
So they most likely tested non-runners and had them start running. We get more efficient at physical exertion with practice. Better coordination of muscle groups. Finding a more efficient pace. Correcting form deficiencies. These all increase capability or reduce energy expenditure.
Re: Scientist busts myths about how humans burn calories
#610Earlier quoted context omitted.
While I agree with that excerice isn't a very efficient way to lose weight I think that you understate how many calories running burns. When I run consistently I need to eat what feels like a lot more food to maintain my weight. Running burns about 700-800 kcal per hour for me (I have a quite small build) which ends up quite a bit over a week (I run 5-8 hours per week).
Think about it this way. The rate at which you burn calories is directly proportional to the rate at which you breathe out CO2 because that what happens with carbon you burn. So if every day you train for an hour so that your breathing is 3 times faster, then you have additional two hours of burning in a day. 23 usual hours plus one worth 3. So you have 26 instead of 24 hours in a day. It's way easier to put 15% less…
Also, you don’t absorb everything you eat. Actually, let me be clear: I have no evidence for this. But the fact that my weight is so consistent despite my radically inconsistent eating and exercising suggests to me that my body can regulate digestion. When I’m in a period when I’m overeating, my body just doesn’t absorb so much.
Again, more speculation, but i would imagine that metabolic disorders involve digestive regulation issues, not just lack of exercise and overeating.